In 1991 I was flying on an operational flight in NI around midnight, using NVGs. Suddenly, the view through them went very strange. I lfted the goggles to see the whole sky ahead was a bright traffic light red! It took a good few seconds to realise it was an unusual manifestation of the Northern Lights! I'd only ever seen them as a pale green/ blue light before. Absolutely spectacular, I'm sure I'll never see it occur like that again. Awesome.
